Drawroll arrangement

ABSTRACT

The drawroll arrangement uses a common shaft to mount the godet and rotor of the drive motor for rotating the godet. Both the godet and rotor are mounted in cantilevered fashion. The stator of the drive motor is also detachably mounted on the bearing housing for the shaft bearings.

United States Patent [191 Wirz [ DRAWROLL ARRANGEMENT [75] Inventor:Armin Wirz, Dietlikon, Switzerland [73] Assignee: Rieter Machine Works,Ltd.,

Winterthur, Switzerland 22 Filed: Nov. 8, 1973 21 Appl. No.: 413,987

[30] Foreign Application Priority Data Nov. 10, 1972 Switzerland16378/72 52 us. or. 72/289 [51] Int. Cl. B21C 1/02 [58] Field of Search72/289, 287; 242/78 [56] References Cited UNITED STATES PATENTS1,950,901 3/1934 Mcllvried 7 2/289 2,262,247 11/1941 Nye 72/2893,296,418 1/1967 Johnson 219/471 3,463,893 8/1969 Chifu 2l9/l0.61

FOREIGN PATENTS OR APPLICATIONS 548,667 3/1932 Germany 72/289 [451 Nov.25, 1975 7,029,963 11/1970 Germany 7,029,962 11/1970 Germany 7,032,3455/1971 Germany 465,127 12/ 1 968 Switzerland 492,809 8/1970 Switzerland989,349 9/1962 United Kingdom 1,495,882 10/ 1 966 France 1,760,6279/1973 Germany Primary ExaminerMichael .ll. Keenan Attorney, Agent, orFirml(e:nyon & Kenyon Reilly Carr 8L Chapin [57] ABSTRACT Thedrawroll-arrangement uses a commontshaft to mount the godet and rotor ofthe drive motor for ro- 'tating the godet. Both the godet and rotor aremounted in cantilevered fashion. The stator of the drive motor is alsodetachably mounted on the bearing housing for the shaft bearings.

4 Claims, 1 Drawing Figure US. Patent Nov. 25, 1975 DRAWROLL ARRANGEMENTThis invention relates to a drawroll arrangement and particularly adrawroll arrangement used on drawwinding machines, spin-draw-windingmachines and draw-twisting machines.

Presently, on draw-winding machines, spin-drawwinding machines anddraw-twisting machines, the drawrolls frequently are each driven by anindividual motor. As a rule, each motor is mounted on the machine frameand is'provided with a free rotor shaft journal onto which the drawrollis mounted in a manner similar to 21 directly mounted belt pulley (e.g.as shown in German Disclosure l,760,627 and German GM 70, 32, 345, aswell as Swiss Pat. Nos. 492,809 and 465,127). The rotor of the drivemotor and the drawroll thus are fixed on the same axle which isrotatably supported in so-called bearing end plates at both ends of astator housing of the motor. Such an arrangement has an advantage inproviding a relatively short construction length. The trend, however,towards ever higher production rates per winding or twisting position,not only requires correspondingly increased rotational speeds of thedrawrolls, but also correspondingly increased heating capacity for theindividual drawrolls. Thus, in the above-mentioned arrangement, the everincreasing heater capacity needed creates a problem in that the drivemotors become exposed to an increasing additional heating. This isparticularly detrimental to the motor coils.

Other draw-winding, spin-draw-winding and drawtwisting machines are alsoknown in which a heated godet or drawroll is mounted on one end of adrive shaft which is rotatably supported by two bearings while a gear isprovided for transmitting the drive power at the other end or betweenthe bearings of the shaft (as described in German AS 1,615,453, US. Pat.Nos. 3,463,893 and 3,296,418, British Pat. No. 989,349 as well as FrenchPat. No. 1,495,882). Such arrangements, however, have a disadvantage inthat the position of the godet shaft, once chosen, is rigidly determinedand cannot be adapted for any adjustments which might be needed lateron.

Still other arrangements are also known in which a heated godet ordrawroll is mounted on one end of a drive shaft while a coupling memberis provided at the other end for transmitting the drive power. The drivepower, in this case, as a rule, is supplied by an individual drive motorof a known construction which is equipped with two bearings for themotor rotor shaft while one end of the shaft is provided with a couplingmember corresponding to the coupling member mounted onto the godetshaft. As this arrangement necessitates the use of a coupling and fourbearings, a relatively complex and expensive construction results(German GM 70, 29, 962 and 70, 29, 963).

Accordingly, it is an object of the invention to reduce the number ofbearings required in a drawroll arrangement.

It is another object of the invention to reduce the heating effect of aheated godet on a motor of a draw -roll arrangement.

It is another object of the invention to avoid the use of couplingmember between a drive motor shaft and a godet shaft.

Briefly, the invention provides a drawroll arrangement for draw-winding,spin-draw-winding and drawtwisting machines having a common rotatableshaft on which a godet is mounted in cantilevered fashion at one end anda rotor of a drive motor for driving the godet is mounted incantilevered fashion at the other end. In

addition, the common shaft for directly transmitting the drive forcefrom the motor to the godet is rotatably supported by two bearingswithin a housing situated between the godet and drive motor.

These and other objects and advantages of the invention will become moreapparent from the following detailed description and appended claimstaken in conjunction with the accompanying drawing in which:

The drawing illustrates a cross-sectional view of a drawroll arrangementaccording to the invention.

Referring to the drawing, the drawroll arrangement substantiallycomprises a heated'or unheated godet l constructed as a drawroll and adrive motor 2 with a rotor 3 and stator 4. The godet l and the rotor 3are mounted on a common shaft 5 which directly transmits a drive forcefrom the motor 2 onto the godet 1. For this purpose, the shaft 5 isprovided witha journal 6, 7 of any suitable type at each end. Thus e.g.the journal 6 for the godet 1 can be provided as usual with a conicalend portion facilitating the exchange of the godet 1 and the journal 7is chosen to be of cylindrical nature with the rotor 3 press-fittedthereon.

The shaft 5 is rotatably supported by two bearings 8, 9 arranged betweenthe two shaft journals 6, 7 or the godet 1 and the rotor 3 respectivelyin such manner that each of the two shaft journals 6, 7 extends outwardfrom the bearings 8 and 9, respectively, in cantilevered fashion. Bothbearings 8, 9 are arranged in a pair of end walls of a common bearinghousing 10. The bearing housing 10 is provided with suitable mountingmeans 1 1 and is mounted on a machine frame 13, for example, by means ofmounting screws 12, in order to be adjustably and detachably arranged.As shown, the godet is mounted exteriorly of the housing 10.

The stator 4 of the drive motor 2 is also arranged in a separate motorhousing 14, the outside of which is closed by a cover end plate 15 whichis detachably mounted on the face side. The stator 4 is secured to thehousing 14. The cover end plate 15 is void of any bearing for the shaft5. The other face side of the housing 14 opposite to the end plate cover15 is provided with a mounting flange, mounting supports or, e.g. merelywith bores parallel to the axis for detachably mounting the stator 4 andhousing 14 exteriorly on the bearing housing 10 by means of screws 16.

If heated godets l are used, the heating can be effected by a heatingdevice 17 of any type as chosen, such as e.g. by a resistance heater orby an inductive heater.

In order to provide adjustability of the rotational speed of the godetl, a supply of preferably multiphase alternating current of controllablefrequency is supplied by a suitable supply device 18, e.g. acontrollable frequency invertor. Furthermore, in the space betwen thetwo bearings 8, 9 in the housing 10 e.g. an inductive measuring valuetransducer is provided consisting of a rotating induction coil 19mounted on the shaft 6 and of a stationary induction coil 20 mounted inthe housing 10.

A considerable advantage of the inventive drawroll arrangement is thatthe two bearings arranged in the end plates of normal drive motors,which would otherwise be needed if such motors are used, are eliminated.

A further advantage is that, if heated godets 1 are used, the distancebetween the godet l and the drive motor 2 is enlarged. This considerablyreduces the heating of the motor 2. Furthermore, no coupling members areneeded between the motor shaft and godet shaft. As opposed to gear trainarrangements, the rotational speeds of the drawroll of a whole machinefor processing different material types and for different processingcharacteristics can be divided freely into groups or individually andcan be controlled in groups or individually.

A further advantage of the drawroll arrangement is that the shaftdiameter between the bearings 8, 9 and the distance between the bearings8, 9 can be chosen as desired. In previous constructions wherein a motoris arranged between bearings, the shaft diameter between the bearingshas been limited by the motor rotor. These two values, namely, shaftdiameter between the bearings and the distance between the bearings,which are also determining factors of the critical rotational speed ofthe drawroll arrangement, allow the drawroll arrangement according tothe invention to be laid out optimally in this respect. Furthermore, thespace between the bearings 8, 9 can be used for the arrangement of ameasuring value transducer for transmitting a signal supplied e. g. by atemperature measuring gauge mounted within the drawroll.

What is claimed is:

l. A drawroll arrangement comprising a machine frame;

a shaft;

a godet mounted on one end of said shaft;

a drive motor mounted at the opposite end of said shaft, said motorhaving a rotor secured on said opposite shaft end;

a bearing housing axially adjustably mounted on said machine frame andincluding a pair of end walls; and

a pair of bearings each mounted in a respective one of said housing endwalls and rotatably supporting said shaft with said ends disposed incantilevered fashion.

2. A drawroll arrangement as set forth in claim 1 wherein said rotor ispress-fitted onto said shaft end.

3. A drawroll arrangement as set forth in claim 1 wherein said drivemotor includes a stator housing detachably secured to said bearinghousing.

4. A drawroll arrangement comprising a machine frame,

a bearing housing axially adjustably mounted on said machine frame andincluding a pair of end walls,

a pair of bearings arranged in said end walls of said bearing housing,

a shaft rotatably supported in said bearings and having a journal ateach end extending outwards from a respective one of said bearings,

a motor housing secured exteriorly to said bearing housing,

a drive motor within said motor housing having a rotor mounted on one ofsaid journals of said shaft and a stator secured to said motor housing,and

a godet mounted on the other of said journals exteriorly of said bearinghousing.

1. A drawroll arrangement comprising a machine frame; a shaft; a godet mounted on one end of said shaft; a drive motor mounted at the opposite end of said shaft, said motor having a rotor secured on said opposite shaft end; a bearing housing axially adjustably mounted on said machine frame and including a pair of end walls; and a pair of bearings each mounted in a respective one of said housing end walls and rotatably supporting said shaft with said ends disposed in cantilevered fashion.
 2. A drawroll arrangement as set forth in claim 1 wherein said rotor is press-fitted onto said shaft end.
 3. A drawroll arrangement as set forth in claim 1 wherein said drive motor includes a stator housing detachably secured to said bearing housing.
 4. A drawroll arrangement comprising a machine frame, a bearing housing axially adjustably mounted on said machine frame and including a pair of end walls, a pair of bearings arranged in said end walls of said bearing housing, a shaft rotatably supported in said bearings and having a journal at each end extending outwards from a respective one of said bearings, a motor housing secured exteriorly to said bearing housing, a drive motor within said motor housing having a rotor mounted on one of said journals of said shaft and a stator secured to said motor housing, and a godet mounted on the other of said journals exteriorly of said bearing housing. 